<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 登陆表单区域 -->
      <el-form
        label-width="0px"
        class="login_form"
        :model="loginForm"
        :rules="loginFormRules"
        ref="loginFormRef"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            v-model="loginForm.username"
            prefix-icon="iconfont icon-yonghuming"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            prefix-icon="iconfont icon-mima"
            type="password"
          ></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登陆</el-button>
          <el-button type="info" @click="resetLoginForm">重制</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //登陆表单的数据绑定
      loginForm: {
        username: 'admin',
        password: '123456',
      },
      //表单验证规则
      loginFormRules: {
        //验证用户名是否合法
        username: [
          { required: true, message: '请输入登陆名称', trigger: 'blur' },
          {
            min: 3,
            max: 10,
            message: '长度在 3 到 10 个字符',
            trigger: 'blur',
          },
        ],
        //验证密码是否合法
        password: [
          { required: true, message: '请输入登陆密码', trigger: 'blur' },
          {
            min: 6,
            max: 10,
            message: '长度在 6 到 15 个字符',
            trigger: 'blur',
          },
        ],
      },
    }
  },
  methods: {
    resetLoginForm() {
      //重制登陆表单
      this.$refs.loginFormRef.resetFields()
    },
    login() {
      //获取表单的方法，通过async的方法异步跑箭头函数，获取当前表单的验证状态
      this.$refs.loginFormRef.validate(async (valid) => {
        //如果验证状态是false，直接return
        if (!valid) return
        //否则发送axios请求，通过解构获得返回值的data并且重新赋值给res
        const { data: res } = await this.$axios.post('login', this.loginForm)
        //判断，如果res中的登陆状态码不是200，则弹消息提醒用户用户名或密码错误
        if (res.meta.status !== 200)
          return this.$message.error('用户名或密码错误')
        //否则弹窗提示登陆成功
        this.$message.success('登陆成功')
        // console.log(res);
        //并且将登陆成功返回的token存在session中，用来判断用户是否登陆
        window.sessionStorage.setItem('token', res.data.token)
        //跳转到首页
        this.$router.push('/home')
      })
    },
  },
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    .avatar_box {
      width: 130px;
      height: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }
  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }
  .btns {
    display: flex;
    justify-content: flex-end;
  }
}
</style>